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Updated: Jun 5, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Efficient sorting of orbital angular momentum states of light
Gregorius C G Berkhout1, Martin P J Lavery, Johannes Courtial
1Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands. j.berkhout@cosine.nl
Abstract:
We present a method to efficiently sort orbital angular momentum (OAM) states of light using two static optical elements. The optical elements perform a Cartesian to log-polar coordinate transformation, converting the helically phased light beam corresponding to OAM states into a beam with a transverse phase gradient. A subsequent lens then focuses each input OAM state to a different lateral position. We demonstrate the concept experimentally by using two spatial light modulators to create the desired optical elements, applying it to the separation of eleven OAM states.
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